VDR and posterior cortical atrophy: Inadequate sun exposure with consequent low calcitriol levels has been implicated with higher risks of PCa.31 The African skin in temperate regions is at a disadvantage as it would require higher volume of sunlight to produce calcitriol.28 Sunlight exposure has an inverse relationship with PCa mortality, as even PCa risk is greater in men with lower levels of vitamin D.32 VDR expression did not show any significant variations based on the race/ethnic origin of patients with PCa in this cohort, perhaps because of disparity in representation of some ethnicities in TCGA.